Fatigue Analysis of Deepwater Hybrid Mooring Line Under Corrosion Effect

Qiao, Dongsheng; Yan, Jun; Ou, Jinping

doi:10.2478/pomr-2014-0032

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…Table 2. Short-term sea atates (in grey, we show the sea state used for comparison in Figure 5) [30]. Figure 8 shows the electrical cable configuration.…”

Section: Fatigue Analysismentioning

confidence: 99%

“…The SS conditions for fatigue life evaluations are selected from the South China Sea S4 area, the angle of incidence of wind and waves is fixed to the direction coinciding with to the X-axis, that is orthogonal to the cable longitudinal extension, since this is recognized to be the most critical configuration for fatigue in umbilical cables. The chosen sea states are listed in Table 2 in accordance with the wave scatter diagram of the South China Sea S4 [30] in a one year period. The wind speed profile, representing the variation of the mean wind with the height above the still water level U(z), is evaluated by the power-law model shown in Equation 6, where U 10 is 10 min average wind speed at a 10 m height above the sea still water level, and α is the power-law profile [29]:…”

Section: Environmental Conditions and Considered Sssmentioning

confidence: 99%

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Fatigue Life Assessment for Power Cables in Floating Offshore Wind Turbines

et al. 2020

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In this paper, a procedure is proposed to determine the fatigue life of the electrical cable connected to a 5 MW floating offshore wind turbine, supported by a spar-buoy at a water depth of 320 m, by using a numerical approach that takes into account site-specific wave and wind characteristics. The effect of the intensity and the simultaneous actions of waves and wind are investigated and the outcomes for specific cable configurations are shown. Finally, the fatigue life of the cable is evaluated. All analyses have been carried out using the Ansys AQWA computational code, which is a commercial code for the numerical investigation of the dynamic response of floating and fixed marine structures under the combined action of wind, waves and current. Furthermore, this paper applies the FAST NREL numerical code for comparison with the ANSYS AQWA results.

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“…Table 2. Short-term sea atates (in grey, we show the sea state used for comparison in Figure 5) [30]. Figure 8 shows the electrical cable configuration.…”

Section: Fatigue Analysismentioning

confidence: 99%

Section: Environmental Conditions and Considered Sssmentioning

confidence: 99%

Fatigue Life Assessment for Power Cables in Floating Offshore Wind Turbines

et al. 2020

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“…According to the author, studies about the design of the mooring system and several dynamic placement tests are required. Later, Qiao et al [6] performed a numerical study addressing corrosion's influence on anchorage lines and ties made of steel and polyester. The authors investigated how the corrosion influences the number of cycles supported by the lines under fatigue.…”

Section: Introductionmentioning

confidence: 99%

A Simplified Numerical Method for the Design and Analysis of FPSO Platform Brackets Subjected to Operational Conditions

Martins

Pinto

Fragassa

et al. 2020

JMSE

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The present work develops a simplified computational methodology to predict brackets’ mechanical behavior to support mooring systems’ fairleads under maximum environmental loads. The methodology consists of estimating environmental loads in Campos’s basin (Brazil) using standards available in the literature and applying them to determine the stress distribution in the brackets’ solid domain using a code based on the Finite Element Method. The brackets studied here are composed of AH36 steel plates. Six different geometric configurations for the brackets considering thinner plates than those ordinarily employed in the existent brackets of the P-66 Petrobras oil production platform were studied. Theoretical recommendations about geometric configurations to reduce the von Mises maximum stress in brackets’ plates were determined in the light of constructal design. The results proved the importance of the geometric investigation in this problem. For instance, for the accidental limit state (ALS) the best configuration leads to a mechanical performance two times superior to that reached for the worst one, which had a maximum stress superior to the yielding limit. Moreover, the best designs for the superior and inferior brackets in the ALS have different configurations.

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“…In terms of dynamic response of the mooring systems with the damaged mooring lines, Huang et al [23] performed a fatigue analysis of a polyester taut-wire mooring system of a floating production storage and offloading (FPSO) model and investigated the response of the mooring system with an one-line failure. Qiao et al [24] investigated the corrosion effect on fatigue life of two mooring systems. Ahmed et al [25] was apparently the first to evaluate the dynamic response of truss spar platforms for various catenary mooring configurations with the damage levels of the mooring lines and simplified these lines as springs.…”

Section: Introductionmentioning

confidence: 99%

Effects of Damaged Fiber Ropes on the Performance of a Hybrid Taut-Wire Mooring System

Lian

Yim

Zheng

et al. 2019

Journal of Offshore Mechanics and Arctic Engineering

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In this study, effects of damage levels of fiber ropes on the performance of a hybrid taut-wire mooring system are investigated. The analysis is performed using a numerical floating production storage and offloading (FPSO) model with a hybrid mooring system installed in 3000 m of water depth. An in-depth study was conducted using the numerical model, the dynamic stiffness equation of damaged fiber ropes, the time-domain dynamic theory, the rainflow cycle counting method, and the linear damage accumulation rule of Palmgren-Miner. Results indicate that, in a mooring line with an increasing damage level, the maximum tension decreases, while the offset of the FPSO increases. Particularly, when a windward mooring line failure occurs, in addition to the significant increase in the offset of the FPSO, the maximum tension, tension range, and annual fatigue damage levels of the remaining lines adjacent to the failed also increase significantly. The present work can be of great benefit to the evaluation of the offset of the floating platform, the tension response, and the service life of the hybrid mooring systems.

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Fatigue Analysis of Deepwater Hybrid Mooring Line Under Corrosion Effect

Abstract: In the deepwater exploitation of oil and gas, replacing the polyester rope by a wire in the chain-wire-chain mooring line is proved to be fairly economic, but this may provoke some corresponding problems.

Cited by 10 publications

References 16 publications

Fatigue Life Assessment for Power Cables in Floating Offshore Wind Turbines

Fatigue Life Assessment for Power Cables in Floating Offshore Wind Turbines

A Simplified Numerical Method for the Design and Analysis of FPSO Platform Brackets Subjected to Operational Conditions

Effects of Damaged Fiber Ropes on the Performance of a Hybrid Taut-Wire Mooring System

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